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Q5.6(viii):
Using IUPAC norms write the formulas for the following: Hexaammineplatinum(IV)

Solution :

Step 1: Identifying the Coordination Entity Components

To determine the chemical formula of the coordination compound Hexaammineplatinum(IV), we decompose the IUPAC name into its constituent parts based on coordination chemistry nomenclature rules:

  • Ligand: "Hexaammine" indicates six ($6$) ammonia molecules ($NH_3$) acting as ligands. Since it is neutral, the prefix "ammine" is used.
  • Central Metal Ion: "Platinum" is the metal center, represented by the symbol $Pt$.
  • Oxidation State: The Roman numeral $(IV)$ indicates the central metal ion is in the $+4$ oxidation state ($Pt^{4+}$).

Step 2: Determining the Charge of the Coordination Sphere

The total charge of a coordination entity is calculated by the sum of the oxidation state of the central metal and the charges of the ligands attached to it [Per the IUPAC rules for coordination nomenclature].

Let $x$ be the total charge of the coordination sphere:

$x = (\text{Charge of Metal}) + (\text{Number of ligands} \times \text{Charge of ligand})$

$x = (+4) + (6 \times 0)$ [Since $NH_3$ is a neutral molecule with a charge of $0$]

$x = +4 + 0 = +4$

Step 3: Constructing the Formula

According to the standard IUPAC convention for writing coordination formulas, the central metal atom is written first, followed by the ligands in alphabetical order enclosed in square brackets [Ref: IUPAC Red Book, Section IR-9.2.3.1].

  • Metal: $Pt$
  • Ligand: $(NH_3)_6$
  • Coordination Entity: $[Pt(NH_3)_6]$
  • Total charge of the entity: $+4$

Visual Representation of the Coordination Geometry

Pt NH₃ NH₃ NH₃ NH₃ NH₃ NH₃

Final Solution: $[Pt(NH_3)_6]^{4+}$


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